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Dairy Cattle And Reproduction

Subjects : industries, dairy
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Depository for semen during insemination. where urine leaves the body






2. Cycle that lasts weeks (ovulation->hormone cycles->ovulation)






3. Front feet and head first. (except for hogs and dogs)






4. Largest dairy cow - largest udder - highly vascular - eat 40-50% dry matter (eat alot) - most total butterfat






5. 24 hours before end of estrus cycle






6. 1. seminiferous tubules - 2. sertoli cells - 3. leydid or interstitial cells






7. 1. sperm is not implanted in egg until hours after breeding. 2. fetal growth has not yet finished.






8. Reproduction. more offspring leads to more feed costs - but is offset by reproduction numbers






9. Animals which have many estrous periods per year (ex: cow - sow)






10. Boars and stallions-> deliver semen directly into the cervix. bulls and rams-> deliver semen into the vagina.






11. Pulls sperm and egg together - gets body ready for pregnany - stimulates growth cells - develops mammary glands - starts to deposit fat.






12. 1-2 days






13. Produce testosterone. located between the seminiferous tubules






14. Depository for semen during insemination. where urine leaves the body






15. (male) Primary sex organ - produces sperm (male gamete) and male sex hormones - 2 total






16. 1. bring in new genes - 2. replace males with leg problems (difficulty breeding) Note: culling has a much greater emphasis in the dairy industry vs the beef industry.






17. Help to signal hormone levels which we need both in the brain right next to each other.






18. Animal which has been castrated after puberty






19. (from Jersey Islands in Great Britain) Smallest cow - least milk - highest butterfat %






20. (FSH) helps to regulate puberty - needed every day - stimulates the sertoli cells to produce nutrients for the sperm






21. Animals which have only one estrous cycle (ex: dog - fox)






22. (FSH) helps to regulate puberty - needed every day - stimulates the sertoli cells to produce nutrients for the sperm






23. Milk ~305 days - dry 60 days prior to calving






24. The more stressed out the male is - the less sperm he is going to produce






25. ~305 days (altough often longer due to breeding difficulties)






26. Parturition is controlled by...






27. Allows extension of penis without fibro-elastic penis






28. FEED






29. Completes uterine growth initiated by estrogen and prepares the uterus for nourishment of developing embryo if pregnancy occurs - supports pregnancy by maintaining quiescent state of reproductive tract and suppresses mating behavior - prevents ovulat






30. 45-60 days after breeding; re-breed as required






31. 14-19 (17) days






32. Sperm production






33. % of fat in milk. makes cheeses and ice cream. regulates cost of milk






34. Microscopic - make sure not sterile - very few bulls are actually tested






35. Look for infection - split - and rupture of the penis






36. Can survive ~7 days in cow. vast majority <48 hours






37. Way to know everything is alright with the breeding male






38. Produce testosterone. located between the seminiferous tubules






39. Serves as a bone cradle for the reproductive system. used greatly in palpation as a 'landmark'.






40. Milk ~305 days - dry 60 days prior to calving






41. Milk made by mother which includes antibodies for the calf. MUST be given to the calf within the first 24 hrs of life. also provides calf with energy stores. effectiveness lasts from 4-8 months of age.






42. Failure to have one testis (gonad) to descend






43. What about the sperm for a bull which has been castrated but still has testicles?






44. Male on one pin and female on other side






45. Not being bred back into herd. horses are seasonal breeders vs. cows as anytime breeders






46. 10-37 (21) days






47. Earlier you castrate a male - the easier it is on the animal. the longer you wait - death rates increase






48. (LH) stimulates the Leydig cells to produce testosterone






49. Castration tool which clamps down on the vans deferens. causes the sperm to not reach the penis to be ejaculated






50. To remove/separate testicles from animal's body before animal reaches puberty